I don't like posts that lay emphasis on signature campaign as the reason for the forum being active. I don't think the presence of signature campaigns is detrimental to anyone in the forum.
I think the scarcity of signature campaign can be a motivation for forum members to improve post quality and get merits so they stand a better chance of getting accepted into good campaigns when the opportunity comes.
I have observed that when people campaign fin they don't post as regular they post unlike when they are in the signature campaign, do you know that some people may like make five posts daily but when they are not in campaigns you will see that it hardly before they make at least five posts daily, so it's a signature campaign that keeps some accounts active in the forum, so many reputable members who is not in the forum make only one post daily or five posts weekly.
It could be that or it could be that there isn’t that many interesting topics and posts like before. In the last year, there has been rampant use of AI in the forum. I understand if old members are bored of reading and responding to generic posts. My question to you OP, do you think your posting pattern would change if you’re not in a signature campaign?